I didn't have a magnet with me and we were on our way to my grandnephew's birthday party so I didn't take time to look closely, but my impression was that it's had the front door window openings welded up (to fit fixed glass) and a generous slathering overall of Bondo to cover the vents and body seams and smooth the driprails. If I go down there again I'll have a closer look, but that may be a year or so.
If it's a fiberglass fake, it's very convincing - and I want one (less the claw machines).

...I'd drop that sucker over a buggy chassis in a heartbeat.
It's outside the Super Jump Party Zone at the Commons Mall (1928 S Commons in Federal Way WA)